11 be in a black mood 情绪极差
to be so negative about everything that it is impossible for anyone to reason with him/her
example: my father has been in a black mood for days, we dare not say anything to him.
12 new blood 新成员
new people brought into an organization to introduce different and original ideas
example: it was decided to bring new blood into the school by employing teachers with the latest training.
13 feeling blue 感到无精打采
feeling sad or depressed
example: she’s feeling blue, because the man she loves is far away.
14 get to the bottom of something 弄清真相
to find out the truth about something
example: i’m trying to get to the bottom of why david left without saying goodbye.
15 a piece of cake 轻松的事
something which is very easy to do
example: here…let me put the batteries in for you. it’s a piece of cake.